C29 compile/unit seam, task 3 of the self-description plan: every
aura-std NodeSchema literal threads its one-line doc. Four texts were
corrected against the actual eval/finalize semantics rather than taken
from the plan table verbatim: Delay is a lag-N register (not one-step),
GatedRecorder flushes an ungated final row at finalize, Latch is a
level-sensitive set/reset register (captures no input), SeriesReducer
emits its single summary row at finalize (not per cycle).
Gate: cargo build -p aura-std --lib clean; full std test run follows at
the all-crates gate once strategy/backtest/engine thread their sites
(the earlier per-crate test gate was unsatisfiable in isolation --
std's dev-deps pull crates whose sites belong to later tasks).
refs #316
M3 machinery for BLOCKER #138: sink reductions can now fold online instead of
buffering every per-cycle row to an unbounded channel.
- aura-core: additive `Node::finalize` end-of-stream hook (default no-op) +
`SeriesFold` online accumulator (last / max_drawdown / sign_flips).
- aura-engine: `Harness::run` calls `finalize` once per node in topo order after
the source loop; `summarize` refactored to drive `SeriesFold` (byte-identical),
the now-dead `sign0` removed.
- aura-std: `GatedRecorder` (emits only gated rows + the final row on finalize)
and `SeriesReducer` (folds one f64 series, emits one summary row on finalize),
both emitting the `Recorder` channel type — no aura-engine dependency.
- Integration tests: folded reductions are byte-for-byte equal to the
raw-recorder path; the R-reduction's peak memory is O(trades), independent of
cycle count.
Ratified two off-plan fixes the implementer made in the tests (both plan defects,
not code defects): the GatedRecorder correctly flushes the final non-gated row on
finalize, so the retained count is K_TRADES + 1; and the heterogeneous PM record
needs kind-correct zero scalars (a blanket f64 zero is rejected by the kind-typed
AnyColumn::push).
Wiring these reducers into the stage1-r sweep (the actual O(cycles)->O(trades)
win) follows next. refs #138
claude
Brummel